Welcome to Gaia! ::

Does that effect when your period comes? 'Cause I'm almost 2 weeks late, and I already went to Planned Parenthood and got a pregnancy test. Came out negative....

Yes, Plan B can cause changes in your menstrual cycle. Many women bleed after taking Plan B.

Plan B needs to be taken within 72 hours of the sexual encounter. So if you are two weeks late, Plan B would not be an option at this point.

Well, I suppose technically it can be taken any time, even three weeks after the encounter. xp However, it is supposed to be taken within 72 hours. The sooner, the better. Taking it within 24 hours is ideal.

"If it is taken within 3 days (72 hours) after unprotected sex, it will decrease the chance that you will get pregnant by up to 89%. That means 7 out of every 8 women who would have gotten pregnant will not get pregnant. And Plan B® works even better if you take it within the first 24 hours after unprotected sex."
http://www.go2planb.com/ForConsumers/AboutPlanB/WhatIsPlanB.aspx

"Plan B® should be taken within 3 days (72 hours) of unprotected sex and can reduce the risk of pregnancy by up to 89%. But the sooner you take it the more effective it will be."
http://www.go2planb.com/ForConsumers/Index.aspx



There are many reason periods might be late.

People respond to Plan B differently. Some people experience bleeding soon after taking the medication, others do not.

Plan B is not 100% effective even if taken within the three days. So even though you took Plan B, you still could be pregnant.

If you were one week late at the time you started Plan B and were sexually active before that, you could have already been pregnant when you started the Plan B. If you are already pregnant, Plan B will not work. If you were only one week late at the time that you started Plan B, that would be too soon for you to show up on many pregnancy tests.

If you're concerned, try taking a home pregnancy test or visiting your ob-gyn again.

Maybe you missed the part where I said you can visit the ob-gyn again if you are still worried. I understand you went there already, but you can go a second, or even third, or fourth time. You can go as many times as you want or need, especially if you are experiencing anything unusual or are worried.

It does not necessarily prove anything if she tested you. Women do not show up as pregnant right away on pregnancy tests. So it's possible that you are pregnant even if you had a negative pregnancy test recently.